Security lines at O'Hare International Airport can vary throughout the day, depending on flight schedules and seasonal travel demand. TSA Wait Times Ohare Early mornings and late afternoons are usually the busiest, especially on weekends. Arriving at least two hours before a domestic flight gives you enough time to move through screening without feeling rushed. Checking live updates before heading to the airport can help you adjust your timing. Keep your identification ready, organize your carry on bag properly, and follow liquid guidelines carefully. A little preparation goes a long way toward making your departure smooth and stress free.